Water-soluble high molal oxyalkylated esters, and method of making same



Patented Feb. 20, 1945 WATER-SOLUBLE man MOLAL OXYALKY- wrap Es'rnas, AND METHOD or MAK- mo SAME, I

Melvin De Groote, University City, and Bernhard Keiser, Webster Groves, Mm, assignors to Petrolite Corporation, Ltd, Wilmington, Del., a corporation oi. Delaware No Drawing. Original application July 7, 1941,

Serial No. 401,379.

Divided and this application March 9, 1943, Serial No. 478,590

11 Claims. (Cl. 260-809) This invention relates to a new chemical product, our present application being a division of our pending application for patent Serial No. 401,379, filed July 7,1941, for Process for breaking petroleum emulsions, which subsequently matured as U. S. Patent No. 2,324,491, dated July 20, 1943.

One object of our invention is to provide a new chemical product or compound that is particularly adapted for use as a demulsifier in the resolution of crude oil emulsions.

' Another object of our invention is to provide a practicable method for manufacturing said new chemical product or compound..

Although one of the primary objects of our invention is to provide a new compound or composition of matter that is an eflicient demulsifler for crude oil emulsions of the water-in-oil type, the said compound or composition of matter may be employed in other arts, as hereinafter indicated. It also may have additional uses in various other fields which have not yet been investigated.

The new chemical compound or composition of acted with a polybasic carboxy acid,,which, similarly, may conveniently be indicated as being of the dibasic type. by the formula HOOC.D.COH, then the fractional ester obtained by reaction between equimolar quantities may be indicated by the following formula:

The polyethylene glycol may be characterized by materials of the kind such as heptaethylene glycol, octaethylene glycol, nonaethylene glycol, decaethylene glycol, to and including heptadecaethylene glycol. For convenience, these polyethylene glycols may be indicated by the following formula OH(C2H40) 111 in which m varies from 7 through 17.

Instead of, polyethylene glycols, one may use polypropylene glycols or polybutylene glycols.

- Thu for convenience, in thev broadest aspect, the

polyalkylene glycols employed may beindicated by the following formula:

in which m has its previous significance, and n represents a numeral varying from 2 to 4.

Thus, the bulk of the materials herein contemplated, particularly for use as demulsifiers, may be indicated within certain variations, as hereinafter stated, by the neutral ester derived by esteriflcation of one mole of a glycol of the kind above described, with two moles of a fractional ester of the kind previously described. The formation of the compound may be indicated by thefollowing reaction, although obviously, it is immaterial what particular procedure is employed to produce the particular chemical compound or product:

T.OOC.D.COO (Cal-I40) m-1C2H4.00C.D.COO.T

glutaconic, and various others, including citric,

- malic, tartaric, and thelike. The selection of the particular tribasic or 'dibaslc, acid employed is usually concerned largely with convenience of manufacture of the finished ester, and also of the price of the reactants. Generally speaking, the

, greater ease than the acid itself. I For this reason,

maleic anhydride is particularly adaptable; and also, everything else considered, thecost'is comparatively low on a per molar basis, even though somewhat higher on a per pound basis. Succinic acid or the anhydride has many of the attractive qualities of maleic anhydride; and this is also true of adipic acid. For purposes of brevity, the bulk of the compounds hereinafter illustrated will refer to the use of maleic anhydride, although it is understood that any other suitable polybasic acid may be employed. Furthermore, for purposes of convenience, reference ismade to the use of polyethylene glyc'ols. As has been previously indicated, such glycols can be'replaced by suitable polypropylene or polybutylene compounds.

Asfar as the range of oxyalkylated compounds employed asreactants is concerned, it is our preference to employ those having approximately 8-12 oxyalkylene groups, particularly 8-12 oxyethylene groups. The preference to use the oxyethylated compounds is due, largely, to the fact that they are commercially available, and particularly so in two desirable forms. The most desirable form is the so-called nonaethylene glycol, which, although consisting largely of nonaethylene glycol, may contain small amounts of heptaethylene and octaethylene glycols, and possibly minor percentages of the higher homologs. Such glycols represent the upper range of distillable glycols; and they may be conveniently referred to as "upper distillable ethylene glycols. There is no particularly good procedure for making a sharper separation on a commercial scale;

and it is understood that mixtures of one or more of the gylcols may be employed, as well as a single glycol. As pointed out, it is particularly preferred to employ nonaethylene glycol as commercially available, although it is understood that this product contains other homologs, as indicated. Substantially as desirable as the upper distillable polyethylene glycols, are the lower nondistillable polyethylene glycols. These materials are available in the form of a waxy water-soluble material, and the. general range may vary somewhat from decato tetradeca-ethylene glycol. As is well understood, the method of producing such glycols would cause some higher homologs to be formed; and thus, even in this instance, there may be present some oxyethylene glycols within the higher range above indicated. One need not point out that these particular compounds consist of mixtures, and that in some instances, particularly desirable esters are obtained by making mixtures of the liquid nonaethylene glycol with the soft, waxy, lower non-distillable polyethylene glycols. For the sake of convenience, reference in the examples will be to nonaethylene glycol; and calculations will be based on a theoretical molecular weight of 414. Actually,

' in manufacture the molecular weight of the glyimmaterial how the compounds herein conterrplated are manufactured, although we have found it most desirable to react the selected glycol or mixtures of glycols with maleic anhydride in a ratio of two moles of the anhydride for one mole Under such circumstances, we r of the glycol. have found little tendency to form longer chain polymers; and in fact, the product of reaction, if conducted at reasonably low temperatures, appears to be largely monomeric. For convenience, such intermediate product may then be considered as a dibasic or polybasic acid One mole of the intermediate so obtained is then reacted with two moles of the alcoholic material of the kind; subsequently described.

It is to benoted, however, that if, one prepares a fractional acidic ester, then if two moles of the fractional; acidic ester'are reacted with one mole of thepolyethylene glycol,.-there.: is. no pos- I sibility for the formation of polymeric types of esterification products under ordinary conditions. The alcoholic bodies employed as reactants in one mode of manufacture of the present compounds, are oxyalkylated imidazolines substituted in 2-position,by a radical containing. from 11-22 carbon atoms selected from the roup consisting of alicyclic hydrocarbon radicals, aliphatic hydrogen radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazolines containing a member of the class consisting of Imidazole (glyoxaline) is indicated by the following formula:

The imidazolines or, glyoxalidines may be considered as dihydro-derivatives of imidazole (glyoxaline); and thus the expressions "dihydroglyoxalines and glyoxalidines" are often employed. The introduction of two hydrogen atoms at the 4-5 position results in the conversion of imidazole into dihydroglyoxaline, which may be indicated by the following formula:

As to the manufacture of imidazolines, reference is made to the following patents: U. S. Patents Nos. 2,215,861, 2,215,862, 2,215,863 and 2,215,864, dated September 24, 1940, to Waldmann and Chwala.

Imidazolines or glyoxalidines may be regarded as dehydration products of certain amides; and they may be obtained by reacting polyamines and the higher carboxylic acids under certain conditions. The formation of these glyoxalidine compounds, while forming no P rt of the present invention, is indicated by the following scheme:

0 R.C-----0H+H2N.CHa.CH.R1.NH.R:.X

fatty Alkylene polyamine acid 1,2-disubstltuted glyoxalidine wherein R represents an alkyli or alkenyl group containing from 10 to 20 carbon atoms (the residue of a higher fatty acid): R1 represents hydrogen or a-lower alkyl group; R2 represents an alkylene group, or a lower alkyl substituted alkylene group; and X represents a hydroxyl group. an amino group, or an amino-alkylene substituted amino group. See U. S Patent No. 2,214,152,

dated September 10, 1940, to Wilkes.

monocarboxy acids, having more than six carbonatoms, and generally, less than 40 carbon atoms. The commonest examples include the detergentforming acids, i. e., those acids which combine with alkalies to produce soap or soap-like bodies. The detergent-forming acids, in turn, include naturally-occurring fatty acids, resin acids, such as abietic acid, naturally-occurring petroleum acids, such as naphthenic acids, and carboxy acids produced by the oxidation of petroleum. As will be subsequently indicated, there are other acids which have somewhat similar characteristics and are derived from somewhat different sources, and are different in structure, but can be included in the broad generic term previously indicated,

Among sources of such acids may be mentioned straight chain and branched chain, saturated and unsaturated, carboxylic, aliphatic, alicyclic, fatty, aromatic, hydroaromatic, and aralkyl acids including caprylic acid, butyric acid, heptylic acid, caproic acid, capric acid, pimelic acid, sebacic acid, 'erucic acid, saturated and unsaturated higher molecular weight aliphatic acids, such as the higher fatty acids containing at least eight carbon atoms, and including, in addition to those mentioned, melissic acid, stearic acid, oleic acid, ricinoleic acid, diricinoleic acid, triricinoleic acid, polyricinoleic acid,"ricinoste arolic acid, ricinoleyl lactic acid, acetylricinoleic acid, chloracetylricinoleic acid, linoleic acid, linolenic acid, lauric acid, myristic acid, undecylenic acid, palmitic acid, mixtures of any two or more of the above mentioned acids or. other acids, mixed higher fatty acids derived from animal or vegetable sources, for example, lard, cocoanut oil, rapeseed oil, sesame oil, palm kernel oil, palm oil, olive oil, corn oil, cottonseed oil, sardine oil, tallow, soyabean oil, peanut oil, castor-oil, seal oils, whale oil, shark oil and other fish oils, teaseed oil, partially or completely hydrogenated animal and vegetable oils, such as these mentioned; hydroxy and alpha-hydroxy higher carboxylic, aliphatic and fatty acids, such as hydroxystearic acid, dihydroxypalmitic acid,dihydroxystearic acid, dihydroxybehenic acid, alphahydroxy capric acid, alphahydroxy stearic acid, alphahydroxy palmitic acid, alphahydroxy lauric acid, alphahydroxy myristic acid, alphahydroxy cocoanut oil mixed fatty acids, alphahydroxy margaric acid, alphahydroxy arachidic acid, and the like; fatty and similar acids derived from various waxes, such as beeswax, spermaceti, montan wax, Japan wax, coccerin, and carnauba wax. Such acids'include carnaubic. acid,'ce rotic acid, lacceric acid, montanic acid, Dsyllastearic acid, etc. As suggested,

one may also employ higher molecular weight carboxylic acids derived, by oxidation and other methods,'fro m paraffin wax, petroleum and similar hydrocarbons; resinic and hydroaromatic acids, such as hexahydrobenzoic acid, hydrogenated naphthoic, hydrogenated carboxydiphenyl, naphthenic, and abietfc acid; aralkyl *and aromaticacids, such-as hexahydrobenzoic acid, hydrogenated naphthoic, hydrogenated 'poly-carboxy-diphenyl, naphthenic, and abietic acid; aralkyl and aromatic acids, suchas benzoic acid, Twitchell fatty acids, naphthoic acid, car- April 25, 1939, to Waldmann boxy-diphenyl, pyridine carboxyllc acid, hydroxybenzoic acid and the like.

Other suitable acids include phenylstearic acid,

benzoylnonylic acid, campholic acid, fencholic 5 acid, cetyloxybutyric acid, cetyloxyacetlc acid,

chlorstearic acid, etc.

Another source of suitable acids are those commonly referred to as lac acids, such, for example, as the acids derived from shellac. Such acids include variou polyhydroxy acids, for example, aleuritic acid, shelloic acid, and kerrolic acid.

As is well known, one may use substituted acids in which some other non-functional constituent enters the structure of the fatty acid. For instance, one may use aryl-, hydroxy-, alkoxy-, chloro-, keto-, and amino-derivatives. Generally speaking, however, it is always preferableto use the unsubstituted acid, particularly free from substituents which contain either oxygen or nitrogen atoms. Generally speaking, the introduction of hydrocarbon radicals, regardless of source, has

"little efiect, except in altering the hydrophilehydrophobe balance.

One may also employ the blown or oxidized acids, such as blown ricinoleic acid, blown oleic, etc., or estolides derived from blown oils, such as blown castor oil, blown soyabean oil, etc.

Needless to say, the acids themselves need not be employed; but one may readily employ any functionalequivalent, such as the anhydrides, the acyl chloride, or the like. In some instances, the esters, especially in presence of a trace or a sig- I .nificant amount of water, act as the acid itself,

in that the acid is liberated. Unless specific reference is made to a particular isomer, one may employ any isomer or mixture of various isomers, if the acid or acids are so available. We have produced demulsiflers, for use in our process, by the followingprocedures: I HYnnoxYLA'rsn INTERMEDIATE Example 1 l-aminoethyl-2-heptadecenyl glyoxalidine is prepared by mixing one gram mole (282 grams) of oleic acid with two gram moles (206 grams) of diethylene triamine, and heating the mixture for a period of about 16.hours under a distilling column. Water was continuously removed until The quantity of water thus removed amounted to about 1.! moles. Unreacted diethylene triamine was distilled from the reaction mixture under vacuum, and the residue then was purified by mercury, at which point it boiled within a temperature range of 225 to 250 C. About 220 grams of the 1-aminoethyl-2-heptadecenyl glyoxalidine was obtained as a pale yellow liquid. The product also may be designated, by reference to the reactants used in its preparation, as oleyl diethylene triamine.

Prior reaction may be indicated in the following manner:

amount-Jim (RcQofleoleic Acid) Ethylene oxide is-introduced into the-above a temperature of about 245 C. was reached.

distillation at an absolute pressure of 1 mm. of

base at a temperature or about 120-140 (3., until the increase in weight amounts to about 2% pound moles of ethylene oxide calculated upon one pound mole of the base.

The oxyethylation of the previously described compound may be indicated in the following manner:

TH: G

Since 2 /2 moles of ethylene oxide are employed, actually part or the hydroxyethyl radicals would represent the ether alcohol radical OHC2H4OC2H4.

HYDROXYLATED INTERMEDIATE Example 2 moved until a temperature of about 300 C. was reached. Approximately 1.9 moles of water were thus removed. The reaction mixture was then distilled under vacuum to remove excess triethylene tetramlne.

HYDRoxYLATED INTERMEDIATE Example 3 'I'etraethylenepentamine is substituted for triethylene tetramine as a reactant in the preceding example. The glyoxalidineobtained was treated as before with ethylene oxide.

HYDROXYLA'I'ED INTERMEDIATE Example 4 Lauric acid is substituted as a reactant for oleic acid in the three preceding examples.

HYnRoxYLATED INTERMEDIATE Example 5 Ricinoleic acid is substituted for oleic acid in Examples 1-3, preceding.

HYDRoxYLATED INTERMEDIATE Example 6 Naphthenic acid is substituted for oleic acid in Examples 1-3, preceding.

HYDROXYLATED INTERMEDIATE Example 7 'An equivalent molal amount of propyleneoxide' is substituted for ethylene oxide in Examplesl-G,

preceding.

The preferred type of demulsifler is obtained by the action oi! 2-10 moles of the oxyalkylating agent, for instance, ethylene oxide or propylene oxide, on one mole of the imidazoline.

In the hereto appended claims. the addition products formed by reaction with acids or the basic form by reaction with water, is included within the scope of the claim. Similarly, where the claims specify the presence of a member of the class consisting of --N--(R--O)nI-I and NH-(R-O)7LH radicals, i. e., the group introduced by oxyalkylation at the amino hydrogen position, it is understood that R includes groups derived from glycid (hthe like.

Specific attention is directed to the fact that one may use various oxyalkylating agents in addition to those already indicated. For instance, note the oxyalkylating agents specifically enumerated in U. S. Patent No. 2,211,001, and also in U. S. Patent No. 2,208,581, dated July 23, 1940, to Hoefl'elmann. All the oxyalkylating agents mentioned in both of the previously designated patents may be employed as reactants for the manufacture of demulsifying agents contemplated in the present process.

GLYCOL ESTER INTERMEDIATE PRODUCT Example 1 One pound mole of nonaethylene glycol is treated with two pound moles of maleic anhydride, so as toiorm nonaethylene glycol dihydrogen dimaleate. The reaction may be shown more simply as if involving the acid instead of the anhydride, thus:

I ,ormomoomncnfiorwnioooczntooon GLYcoI. ESTER INTERMEDIATE PRODUCT Example 2 A mixture of lower non-distillable polyethylene glycols, representing approximately decato tetradecaethylene glycol, is substituted for nonaethylene glycol in the preceding example.

GLYCOL ESTER INTERMEDIATE PRODUCT Example 3 GLYcoL ESTER INTERMEDIATE PRODUCT Example 4 Adipic acid is substituted for maleic anhydride in, Examples 1-3, preceding.

GLYCOL EsTER INTERMEDIATE PRODUCT Example 5 Oxalic acid is substituted for maleic anhydride in Examples 1-3, preceding.

GLYCOL ESTER INTERMEDIATE PRODUCT Example. 6

' Citric acid is substituted for maleic anhydride in Examples 1-3, preceding; GLYCOL ESTER INTERMEDIATEIPRODUCT Example 7 Succinic anhydride is substituted for maleic anhydride in Examples 1-3, preceding.

The method of producing such fractional esters is well known. The general procedure is to employ a temperature above the boiling point of water and below the pyrolytic point of the reactants. The products are mixed and stirred constantly'during the heating and esteriilcation step. I! desired, an inert gas, such as dried nitromanufacture of ethylene glycol dihydrogen diphthalate. (See U. S. Patent No. 2,075,107, dated March 30, 1937, to Frasier.)

Sometimes esterification is conducted most readily in the presence or an inert solvent that carries away the water of esterification which may be formed, although, as is readily appreciated, such water or esterification is absent when the reaction involves an acid anhydride, such as maleic anhydride, and a glycol. However, if wa-- ter is formed, 'for instance, when citric acid is employed, then a solvent such as xylene may be present and employed to carry off the water 'iormed. The mixture of xylene vapors and water vapors can be condensed so that the water is separated. The xylene is then returned to the reaction vessel for further circulation. This is a conventional and well-known procedure and requires no further elaboration.

CoMrosn'ron or MATTER Example '1 Two pound moles of a material of the kind exemplified by Hydroxylated intermediate, Example 1, are reacted with one pound mole of a glycol ester intermediate product of the kind described under Glycol ester intermediate products, Examples 1, 2 and 3, preceding. Such reaction product is conducted until all carboxyl acidity has disappeared. The time of reaction may vary from a few hours to asmany as 20 hours.

In its simplest aspect the preceding composition of matter may be exemplified in the followingmanner: I

"'H':oooczrncoocmwmocmn cmoooclmcooiii" Conrosrnon or Marten Example 5 A material of the kind described in Hydroxyl- -ated intermediate, Example 5, is substituted for a material described in Hydroxylated intermediate, Example 1. in Composition of matter, Example l.

Courosrrron or Marrrx Example 6 A material of the kind described in Hydroxylated intermediate, Example 6, is sulmtituted for a material described in Hydroxylated intermediate, Example 1, in Composition of matter, Example 1.

Comrosrrron or MATTER Example 7 Glycol ester intermediate products. of the kind exemplified by Examples 4-7, preceding, are substituted for Glycol ester intermediate products, Examples 1, 2 and 3, in the preceding 6 examples.

It is to be noted that this second step is an esterification reaction, and the same procedure is employed as suggested above in the preparation of the intermediate product. Needless to say, any particular method may be used to produce the desired compounds of the kind indicated. In some instances it may be desirable to conduct the esterification reaction in the presence of a non-volatile inert solvent which simply acts as a diluent or viscosity reducer.

In the preceding examples, attention has been directed primarily to the monomeric form, or at least, to the form in which the bifunctional alcohol, i. e., a glycol, and the polyfunction'al acid, usually a bifunctional compound, react to give a chain type compound, in which the adjacent acid and glycol nucleus occur as a structural unit.

For instance, in the monomeric form this may be indicated in the following manner:

acid glycol acid If, however; one prepared an intermediate product employing the r'atioof three moles of maleic anhydri-de and two moles of nonaethylene glycol, the tendency would be to produce a prodvuct which might be indicated in the following manner 2 composition may be indicated in the following ated intermediate, Example 4, is substituted for a material described in Hydroxylated intermediate, Example 1, in Composition of matter, Example 1.

acid glycol acid glycol acid Similarly, three moles of the glycol and four I manner:

in which the charactershave'their previous significance and :1: .is a relatively small whole number less than 10 and probably less tha'nf5; and in the monomeric form :0, of course, is 1. The

limitations on'the size of .1: are probably influenced,largely,. by the fact that reaction leading to further growth dependent upon random contact. j

Some of the products are self-emulsifiable oils,

quently, in the presence of significant amounts of either acids or alkalies..

her of ways which have been suggested by previous manufacturing directions, for instance:

(a) By using a more highly polymerized ethylene" glycol; r

(b) By using a polymeric form instead of a monomeric form in regard to the unit which forms the chain between the two alcoholic nuclei;

By using a polybasic car-boxy acid of lower molecular. weight, for instance, malelc acid instead of adipic acid; and

(d) By using an oxyalkylating imidazoline of lower molecular weight, or having more ether linkages, or more hydroxyl groups, or more basic amino nitrogen atoms.

Indeed, in many instances, the oxyaikylated amidazoline .is water-soluble prior.to reaction with a glycol ester. It is to be noted that in this instance one is not limited to hydroxylated materials which are water-soluble prior to reaction with a glycol ester, but they may, in fact, be perfectly water-soluble.

Actually, a reaction involving an alcohol and an acid (esterification) may permit small amounts of either one or both of the reactants, depending upon the predetermined proportion, to remain in an unreacted state. In the actual preparation of compositions of the kind herein contemplated, any residual acidity can be removed by any suitable base, for instance, ammonia, triethanolamine, or the like, especially in dilute solution. Naturally, precaution should be taken, so that neutralization takes place without saponification or decomposition of the ester. In some cases there is no objection to the presence of the acidic group. Indeed, if a tribasic acid be employed in such a manner as to leave one free carboxyl group, then it is usually desirable to neutralize such group by means of a suitable basic material.

In the hereto appended claims, reference to a neutral product refers to one in which free carboxylic radicals are absent.

Materials of the kind herein contemplated may find uses as wetting, detergent. and leveling agents in the laundry, textile, and dyeing industry; as wetting agents and detergents in the acid washing of fruit, in the acid washing of building stone and brick; as a wetting agent and spreader in the application of asphalt in road building and the like, as a constituent of soldering flux preparations; as a flotation reagent in the flotation separation of various minerals; for flocculation and coagulation of various aqueous suspensions containing negatively charged particles such as sewage, coalwashing waste water, and various trade wastes and the like; as germicides, insecticides, emulsifiers for cosmetics, spray oils, water-repellent textile finish, etc. These uses are by no means exhaustive.

However, the most important.ph8sc of the present invention, as far as industrial application goes, is concerned with the use of the materials previously described as demulsiflers for water-inoil emulsions, and more specifically, emulsions of water or brine in crude petroleum.

A somewhat analogous use or my demulsifying agent is the removal of a residual mud sheath which remains after drilling by the rotary method. Sometimes the drilling mud contains added calcium carbonate or the like to render the mud susceptible to reaction with hydrochloric acid or the like, and thus expedite its removal.

Chemical compounds of thekind herein de- 75 not m Water solubility can be enhanced in a numscribed are also of value as surface tension depressants in the acidization of calcareous oil-bearing strata by means of strong mineral acid, such as hydrochloric acid. Similarly, some members are eflective as surface tension depressants or wetting agents in the flooding of exhausted oil-bearing strata.

As to using compounds of the kind herein described as flooding agents for recovering oil from subterranean strata, reference is made to the procedure described in detail in U. S. Patent No. 2,226,119, dated December 24, 1940, to De Grcote and Keiser. As to using compounds of the kind herein described as demulsifiers, or in particular as surface tension depressant's, in combination with mineral acid or acidization of oil-bearing strata, reference is made to U. S. Patent No. 2,233,383, dated February 25, 1941, to De Grcote and Keiser.

It will be apparent to those skilled in the art that residual carboxyl acidity can be eliminated by esteriflcation with a low molal, for instance, ethyl, methyl, or propyl alcohol, by conventional procedure, so as to give a substantially neutral product. The introduction of such low molal hydrophobe groups does not seriously affect the solubility, and in some instances, gives increased resistance, to soluble calcium and magnesium salts, for such property is of particular value. Usually, however, neutralization with a dilute solution of ammonia or the like is just as practicable and less expensive.

In the hereto appended claims, it is intended that the monomeric forms contemplate also the polymeric forms, insofar that the polymeric forms are nothing more or less than a repetition of the monomeric forms several times over, with th loss of one or more moles of water.

Having thus described our .invention, what we claim as new and desire to secure by Letters Patent is:

1. A water-soluble esterification product, derived by reaction between one mole of a polybasic compound and two moles of a substituted oxyalkylated imidazoline; the polybasic compound being the esterification product of: (A) a polyalkylene glycol having at least 7 and not more than 17 ether linkages, and the alkylene radical thereof containing at least 2 and not more than 6 carbon atoms; and (B) a polybasic carboxy acid having not more than 6 carbon atoms; and the ratio of the esterifying reactants being within the range of more than 1 and not over 2 moles of the polybasic acid for each mole of the glycol; said imidazoline being an oxyalkylated lmidazoline substituted in 2-position, by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazolines containing a member of the class consisting of radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11.

2. A neutral, water-soluble esterification product. derived by reaction between one mole of a polybasic compound and two moles of a substituted oxyalkylated imidazoline; the polybasic compound being the esteriflcation product of: (A) a polyalkylene glycol having at least '7 and than 1'7 ether linkages, :and the alkylene radical thereof containing at least 2 and not more than 6 carbon atoms; and, (B) a polybasic carboxy acid having not more than 6 carbon atoms; and the ratio .of the esteriiying reactants being within the range of more than 1 and not over z'moles of the polybasic acid for each mole of the glycol; said imidazoline being an oxyalkylated imidazoline substituted in 2-position, by a radical con-- taining from ll-22 carbon atoms selected from the group consisting or'alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and

aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidaaolines containing a member of the class consisting of;

v N-(R-O) H and NH(R---O)IH radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11.

3. A neutral water-soluble esterification product, derived by reaction between'one mole of a dibasic compound and two moles of a substituted oxyalkylated imidazoline; the dibasi compound within the range or more than 1 and not over 2 v and n is a whole number greater than 2 and less than 11.

5. A neutral, water-soluble esteriflcation product, derived by reaction between one mole of a dibasic compound and 2 moles of a substituted- ,oxyalkylated imidazoline; the dibasic compound being the esteriflcation product or: (A) a po ethylene glycol having at least 7 and not more than 1'7 ether linkages; and (B) a dibasic carbo'xy acid having not more than 6 carbon atoms; and the ratio or the esteriiyin'g-reactants being moles of the dibasic acid for each mole of the glycol; and said imidazoline being an oxyalkylated being the esterification product of: (A) a poly- 1 alkylene glycol having atleast 7 and not more than 1'7 ether linkages, and the alkylene radical thereof containing at least 2 and not more than 6 carbon atoms; and (B) a dibasic carboxy acid having not more than 6 carbon atoms; and the ratio of the esterifying reactants being within radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11.

4. A neutral, water-soluble esteriflcation product, derived by. reaction between one mole of a -polybasic compound and two moles of a substituted oxyalkylated imidazoline; the polybasic compound being the esterification product of: (A) a' polyalkylene glycol having at least '1 and not more than 17 ether linkages, and the alkylene radical thereof containing at least 2 and not more than 4 carbon atoms; and (B) a polybasic carboxy acid having not more than 6 carbon atoms; and the ratio of the esterifying reactants being within th range of more than 1 and not over 2 moles of the polybasic acid for each mole of the glycol; said imidazoline being an oxyalkylated imidazoline substituted in 2-position, by a radical containing from 11-22 carbon atoms selected from the group consisting of. alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radical substituted by bydroxyl radicals; said oxyalkylated imidazolines containing a member or the class consisting of:

droxylation ot-an oxyalkylated imidazoline subthan 10.

imidazoline substituted in 2-position by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic'hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazolines containing a member oi the class consisting of:

radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11. v

6. A neutral, water-soluble chemical compound of the following formula. type:

'roocncoot (C2H4O) mC2H400C-D.COO]=T in which T is a radical derived by the dehystituted in 2-position by a radical containing from 11-22 carbon atoms selected from the group consisting oi alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazoline containing a member of the class consisting of:

-N-(R'0)flH radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than l1;'O0C.D.COO is the acid radical derived from a dibasic acid by removal of the acidic hydrogen atoms; said acid radical having not over 6 carbon atoms; m represents a numeral varying from 7 to 12; and .1: is a small whole number less and 7. A neutral, water-soluble chemical compound of the following formula type:

TOOC.D.CO0(C2H4Ol mcimoocncoom in which T is a radical derived by the dehydroxylation of an oxy'alkylated imidazoline sub stituted in 2-position by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazolines containing a I member of the class consisting of:

radicals, whereinlR denotes an aliphatic radical of the following formula:

6 carbon atoms; and m represents a numeral varying from 7 to 12.

8. A neutral, water-soluble chemical compound of the following formula:

in which T is a radical derived by the dehydroxylation of an oxyalkylated imidazoline substituted in 2-position by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substitutedby hydroxyl radicals; said oxyalkylated imidazolines containing a member of the class consisting of:

radiCals,-wherein R denotes an aliphaticlradical and n is a whole number greater than 2 and less than 11; QOC.D.'COO is the acid radical derived from maleic acid by removal of the acidic hydrogen atoms; said acid radical having not over 6 carbon atoms; and m represents a numeral varying from '7 to 12.

9 A neutral, water-soluble chemical compound in which T is a, radical derived by the dehydroxylation of an oxyalkylated imiclazoline substituted in 2-position by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated-imidazolines containing a member of the class consisting of radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11; OOC.D.COO is the acid radical derived from succinic acid by removal of the acidic hydrogen. atoms; said acid radical having not over 6 carbon atoms; and m represents a numeral varying from 7 to 12.

10. A neutral, water-soluble chemical compound of the following formula:

TOOC.D.COO (CflHiO) mCiH4OOC.D.COO.T

in which 'I is a radical derived by the dehydroxylation of an oxyalkylated imidazoline substituted in 2-position 'by a radical containing from 11-22 carbon atoms selected from the group consisting of alicyclic hydrocarbon radicals, aliphatic hydrocarbon radicals, and aliphatic hydrocarbon radicalssubstituted by hydroxyl radicals; said oxyalkylated imidazolines containing a member of the class consisting of:

radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11; OOC.D.COO is the acid radical derived from adipic acid by removal of the acidic hydrogen atoms; said acid radical having not over 6 carbon atoms; and m represents a numeral varying from '7 to 12.

11. In the manufacture of the esterification product of the kind described in claim 1, the steps of: (A) esterifying a polyalkylene glycol having at least 7 and not more than 1'7' ether linkages and the alkylene radical thereof containing at aliphatic hydrocarbon radicals substituted by hydroxyl radicals; said oxyalkylated imidazolines containing a member of the class consisting of:

--N-'-(R-O) "H and --NH-(R-0) "H radicals, wherein R denotes an aliphatic radical and n is a whole number greater than 2 and less than 11.

MELVIN DE GRQOTE. BERNHARD KEISER. 

